New Brunswick, New Jersey climate: Normal weather by month, frost dates and records
New Brunswick's normal year runs from 23°F January nights to 87°F July afternoons, with 49.5 inches of precipitation and 29 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.1°C, January lows of −5°C, July highs of 30°C, 1,258 mm of precipitation a year.
- NOAA stationNew Brunswick (3 mi SE)
- Station IDUSC00286055
- Location40.47°N 74.42°W
- Elevation111 ft (34 m)
- From the center1 miles
- Population57,487
On October 23, the normal high in New Brunswick is 64°F and the normal low 42°F, and the chance of measurable rain or snow is 31%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for New Brunswick.
- Jan 40° 23°
- Feb 43° 24°
- Mar 51° 31°
- Apr 63° 41°
- May 72° 51°
- Jun 81° 60°
- Jul 87° 66°
- Aug 85° 64°
- Sep 78° 57°
- Oct 67° 44°
- Nov 56° 35°
- Dec 45° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in New Brunswick each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 23°F. The most precipitation falls in June (4.83 in), the least in February (2.97 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 40°F | 23°F | 31.6°F | 3.74 | 8.3 | 11 | <1 | 26 | 9 h 30 min |
| February | 43°F | 24°F | 33.4°F | 2.97 | 9.3 | 10 | <1 | 24 | 10 h 40 min |
| March | 51°F | 31°F | 40.8°F | 4.40 | 5.2 | 11 | <1 | 18 | 11 h 50 min |
| April | 63°F | 41°F | 51.7°F | 3.89 | 0.6 | 12 | <1 | 4 | 13 h 10 min |
| May | 72°F | 51°F | 61.3°F | 4.03 | 0.0 | 13 | 1 | <1 | 14 h 20 min |
| June | 81°F | 60°F | 70.8°F | 4.83 | 0.0 | 11 | 4 | <1 | 15 h |
| July | 87°F | 66°F | 76.1°F | 4.83 | 0.0 | 11 | 10 | <1 | 14 h 50 min |
| August | 85°F | 64°F | 74.3°F | 4.66 | 0.0 | 10 | 6 | <1 | 13 h 50 min |
| September | 78°F | 57°F | 67.4°F | 4.18 | 0.0 | 9 | 2 | <1 | 12 h 30 min |
| October | 67°F | 44°F | 55.4°F | 4.11 | 0.2 | 10 | <1 | 3 | 11 h 10 min |
| November | 56°F | 35°F | 45.4°F | 3.40 | 0.5 | 9 | <1 | 13 | 10 h |
| December | 45°F | 28°F | 36.9°F | 4.49 | 4.9 | 10 | <1 | 22 | 9 h 20 min |
| Year (annual) | 64°F | 44°F | 53.7°F | 49.53 | 29.0 | 125 | 24 | 111 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 5°C | −5°C | −0.2°C | 95 mm | 21 cm |
| February | 6°C | −4°C | 0.8°C | 75 mm | 24 cm |
| March | 10°C | −1°C | 4.9°C | 112 mm | 13 cm |
| April | 17°C | 5°C | 10.9°C | 99 mm | 2 cm |
| May | 22°C | 10°C | 16.3°C | 102 mm | 0 cm |
| June | 27°C | 16°C | 21.6°C | 123 mm | 0 cm |
| July | 30°C | 19°C | 24.5°C | 123 mm | 0 cm |
| August | 29°C | 18°C | 23.5°C | 118 mm | 0 cm |
| September | 26°C | 14°C | 19.7°C | 106 mm | 0 cm |
| October | 19°C | 7°C | 13.0°C | 104 mm | 1 cm |
| November | 13°C | 2°C | 7.4°C | 86 mm | 1 cm |
| December | 7°C | −2°C | 2.7°C | 114 mm | 12 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00286055; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit New Brunswick?
Normal highs sit between 65°F and 85°F in May, June, August, September and October. Of those, September has the fewest days with rain (9).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00286055.
When is the last frost in New Brunswick?
In New Brunswick, the last spring frost (32°F) comes after April 15 in half of years and after May 1 in one year in ten; the first autumn frost comes before October 26 in half of years and before October 11 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 151 year in 10 after May 1; 9 in 10 after April 2
- First autumn frost, half of years before
- October 261 year in 10 before October 11; 9 in 10 before November 8
NOAA puts the median frost-free season at 193 days, and the season without a hard freeze (28°F) at 218 days.
A hard freeze (28°F) comes after April 2 in half of springs and before November 7 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts New Brunswick in zone 7a in ZIP code 08901. By the map's own method, the average of each year's coldest night over 1991-2020, New Brunswick's NOAA station is in zone 7a: the coldest night of a typical year reaches 4°F (30 complete years).
Frost dates for every NOAA station in New Jersey · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00286055; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in New Brunswick?
In a normal year in New Brunswick, 24 days a year reach 90°F, 111 nights fall to 32°F or colder and 125 days bring measurable precipitation.
- Days at 90°F or more
- 24a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 111a normal year
- Days that stay below freezing
- 16high of 32°F or less
- Days with 0.01 inch of precipitation
- 125a normal year
- Days with 1 inch of snow or more
- 7a normal year
The highest temperature in New Brunswick's official record (kept by the National Weather Service since 1893) is 106°F, on July 2, 1901; the lowest is −16°F, on February 9, 1934.
The wettest calendar year on that record is 2011, with 66.11 in; the snowiest season is 1995–96, with 76.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00286055; records: ACIS (NOAA Regional Climate Centers), NWS threaded record NBRN4thr. Records use complete months only; a month missing more than three days is left out.
How sunny is New Brunswick?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around New Brunswick, 3.9 kWh per square metre a day. July is the sunniest month (80%) and December the cloudiest (66%). Among the 459 U.S. places of 50,000 or more, that ranks tied 352nd (with 32 others) in sunshine.
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 68% | 1.9 |
| February | 71% | 2.8 |
| March | 69% | 3.7 |
| April | 71% | 4.8 |
| May | 70% | 5.4 |
| June | 76% | 6.0 |
| July | 80% | 6.0 |
| August | 78% | 5.2 |
| September | 76% | 4.3 |
| October | 71% | 3.0 |
| November | 72% | 2.2 |
| December | 66% | 1.6 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does New Brunswick need?
A normal year in New Brunswick brings 5,101 heating degree days, 5% fewer than the median U.S. place (5,373), and 1,037 cooling degree days, 14% more than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,486 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,035 | 0 |
| February | 885 | 0 |
| March | 751 | 1 |
| April | 411 | 10 |
| May | 164 | 51 |
| June | 24 | 197 |
| July | 1 | 343 |
| August | 2 | 292 |
| September | 55 | 128 |
| October | 314 | 15 |
| November | 590 | 0 |
| December | 871 | 0 |
| Year (annual) | 5,101 | 1,037 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00286055. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has New Brunswick been warmer than normal lately?
2025 averaged 54.4°F, 0.7°F above the 1991-2020 normal of 53.7°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 55.5°F | +1.8°F | 51.86 | 30.8 |
| 2022 | 54.9°F | +1.2°F | 49.71 | 15.5 |
| 2023 | 55.8°F | +2.1°F | 60.72 | 3.3 |
| 2024 | 56.3°F | +2.5°F | 49.36 | 26.3 |
| 2025 | 54.4°F | +0.7°F | 42.03 | 16.9 |
Over 143 complete years from 1863 to 2025, the station's annual mean temperature rose at a fitted 2.0°F per century (+0.11°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00286055; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does New Brunswick's climate compare?
New Brunswick is warmer than 14 of the other 32 places with their own NOAA record in New Jersey, and wetter than 21. Across the 7,247 U.S. stations with normals, its annual mean of 53.7°F is warmer than 56%.
In the Köppen classification computed from these normals, New Brunswick is Dfa: continental, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near New Brunswick share this climate record?
29 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Sayreville, NJ47,165 people · 5 mi E
- Somerset, NJ23,851 people · 5 mi NW
- South River, NJ16,392 people · 3 mi SE
- Highland Park, NJ15,386 people · 2 mi N
- Franklin Park, NJ13,327 people · 7 mi W
- Kendall Park, NJ10,765 people · 8 mi SW
- South Amboy, NJ10,549 people · 8 mi E
- East Franklin, NJ10,281 people · 3 mi NW
- Blackwells Mills, NJ10,220 people · 9 mi W
- Madison Park, NJ8,798 people · 7 mi E
- Spotswood, NJ8,306 people · 6 mi S
- Dayton, NJ8,241 people · 8 mi SW
- Milltown, NJ7,170 people · 2 mi S
- Jamesburg, NJ5,869 people · 9 mi S
- Franklin Center, NJ5,770 people · 7 mi NW
- Rutgers University-Busch Campus, NJ5,747 people · 4 mi NW
- Six Mile Run, NJ3,185 people · 6 mi W
- Rutgers University-Livingston Campus, NJ3,041 people · 3 mi N
- Keasbey, NJ2,793 people · 7 mi NE
- Helmetta, NJ2,504 people · 7 mi S
- Ten Mile Run, NJ2,288 people · 9 mi W
- Middlebush, NJ2,017 people · 6 mi W
- Voorhees, NJ1,775 people · 4 mi W
- Deans, NJ1,166 people · 7 mi SW
- Griggstown, NJ928 people · 10 mi W
- East Millstone, NJ653 people · 8 mi W
- Pleasant Plains, NJ536 people · 8 mi W
- Millstone, NJ455 people · 9 mi W
- Clyde, NJ108 people · 5 mi W
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about New Brunswick's climate
What is the coldest month in New Brunswick?
January, with a normal high of 40°F and a normal low of 23°F. The warmest is July (87°F by day, 66°F at night).
Does it snow in New Brunswick?
Yes: 29 inches in a normal year, falling on 13 days with 0.1 inch or more, the most in February (9.3 inches).
What is the rainiest month in New Brunswick?
June, with 4.83 in of precipitation in a normal year; the driest is February with 2.97 in.
What plant hardiness zone is New Brunswick in?
The USDA's 2023 map puts New Brunswick in zone 7a in ZIP code 08901. By the same method at New Brunswick's NOAA station, the coldest night of a typical year reaches 4°F (30 years, 1991-2020): zone 7a.
How late can frost come in New Brunswick?
In half of years the last 32°F night comes after April 15; in one year in ten it comes after May 1. Waiting until May 1 leaves about a one-in-ten chance of a later frost.
Nearby and next
- New Brunswick in OctoberThis month day by day, its records and recent years
- New Jersey climateThe statewide normals and every place in the state
- Plainfield, NJ9 miles from this station, 54.9°F a year
- Freehold, NJ14 miles from this station, 54.0°F a year
- Cranford, NJ14 miles from this station, 54.7°F a year
- Hightstown, NJ16 miles from this station, 52.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made